Mold cutting machine and the like



July 3,1945. .R ATTI, v 2,379,419

MOLD CUTTING MACHINE AND THE LIKE Filed Aug.- 2e, 1942 2 sheets-sheet 1 ATTORNEY l July 3, 1945. R. Am] 2,379,419

MOLD CUTTING MACHINE AND THE LIKE Filed 'Aug. 26, .1942 2 Sheets-Sheet 2 in general.`

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Patented July 3,v v1945 UNITED STATES f rlx'rlazN'r` OFFICE l MOLD CUTTING THE LIKE Raphael Atti, Cliifside Park, N. J.

Application August 26, 1942, Serial No. 456,138 A i `(c1. 82-14) c Claims.

This invention relates in general to mold cutting 'machines and the like and more particucutting machine for forming molds which require predetermined precise forms, such as an instance only to secure t`heplate -4y in place butv also to secure the Spacing bars 3 and 2 in place. Adjacent to the spacing bar 3 there is provided the master supporting base I3,-secured to the frame yI. f

Adjacent to the spacing bar 2 and mounted on the plate 4 there is provided the tool supporting base or platform I4.

The masterforrning base I3 lconsists essentially of a bracket having downwardly extending portions I5 and I6 to which are secured the'strips Il and I8 by the screws I 9 and 20 respectively, which clamp vthe base I3 to the oppositely extending as is necessary in the manufacture 'ofcontour.

forming molds, precision parts and reproductions These and other features, capabilities and advantages of the invention will appear fromthe subjoined detail descriptionl of specific embodiments thereof illustratedin the accompanying drawings in which Figure 1 is a plan of a part of a machine made according to one embodiment of the present invention. y

Fig. 2 is a fragmental side elevation of the embodiment illustrated in Fig. 1.

.v Fig. 3 is a section on the line 3-3 of Fig. 1.

Fig. 4 is a section on the line 4-4 of Fig. 1. 1 Fig. 5 is a plan of a part of a machine made according to another embodiment of the invention. l

Fig. 6is a fragmental side elevation of the embodiment illustrated in Fig. 5.

In the present invention advantage is taken of the principle disclosed by the applicant in his prior Patent No. 2,030,850 for Grinding precision tools. As an instance, in the present invention advantage is taken of,that principle to produce vprecision molds,- precision parts and reproductions `in general,

According to the embodiment illustrated in Figs. 1 to 4, inclusive, the frame I isV typical of a standard lathe having a bed to which are secured l secured to the spacing bar 3 by the screws I0. The plate 4 is also connected to the spacing bar 2by the screws II, the screws I0 and II extending through the plate 4 and spacing vbars 3 and 2 respectively into the bed plate of the frame I not flanges 2| and 22 of the-bed plate of the frame I. This base I3 also preferably as shown has a slot 23 to receive the raised portion 24 onthe frame I to facilitate sliding the base I3 along the frame I and aid in positioning the same. rThe base I3 has a journal 25 for receiving the screw 26 rotatably mounted in the extension 21 extending downwardly from the'plate 28. The extension 21, see Fig. 2, has inclined edges to ride in the bayonet slot portions 29 and 30 of the base I 3; The plate 28, see Figs. 1 and 2, has two arms 3| and 32 provided with the screws 33 and 34 respecytively,lextending through the arms 3| and 32 into the plater28 to serve. as jaws for clamping the master 35 on the plate 2 8, As shown. the plate 28 is secured to the basev I3 by four screws 36, 31, 38, and 39. The adjusting screw 26 is provided with an angular wrench receiving head 40 dis posed on the outside of the extension 2.1, as particularly shown in Figs. 1 and ,4. 'The engagement of the head 2l|r and actuation thereof to turn the screw 26 is provided tor position the plate 28 with the master 35 relative to the stylus wheel 4I or a center line.

T he base I4 of this embodiment is secured to the plate 4 by the screws 42 and 43.` To this base the head 44 relative to the bed plate of the frame I. The head 44, in the present instance, has a V-shaped slot 46 to receivethe shank 41 of the cuttingtooly'in the present instanceand preferably provided with a substantially round cutting l head 48.` A cross ypiecey 49 is secured to the head 44, extending acrossthe slot 4 6 into which'exv tends the sety screw 50 to engage the shank 41 and anchor it in position in thevv head 44. n The pate 4, as shown in Fig. .3, is provided'with an opening 5| to enable the pin 52 connected tothe .thepin B1. .1 to 4, inclusive, the .arms 56 and 51 are posi- 'tionedLto extend'belowthe'plate 1|,A andthe arm 59is,positioned to operate 'above the plate '4, the .pins .60 and beingpreferably provided with l.spacers 1.68 and .59 vas shown. The portion 66 Nof -..thearm"59.is .preferably provided with a" hanv.dlel'lil .to .enable theattendantto guide the stylus head 44 to extend down through the plate 4 and below it. Similarly the slide 45 is provided with an opening 53 and the base I4 is provided with an opening 54 substantially in alinement with one another and to afford clearance for the pin 52 in its movements hereinafter to be described. The master 35 in the present instance consists essentially of a flat steel plate having the design cut on the edge 55 facing the stylus wheel 4|. The-pantograpliicdevice now tof-be Adescribed embraces a'devicefor moving thehea'd 44 by means of the pin 52 relative to the position of the stylus Wheel 4| on the design face 55 of the master 35. This device consists essentially-of along-.arm 56, a short arm 51, a connecting 1irik`5'8, anda control arm 59. One end of the arm 56 is connected to one end of the arm 59 bytheepin 6.0. VOne end of the arm 51 is connected tothe arm`59 a short distance from the pin 60 by the pin 6|. 'The'link 58 is .provided with two pin openings the centers o'f. which are space'dfromoneanother a distance equal to the-distancebetweenthe'centersiof the pins 60 and 6|. Through'these 4openin'gsin"the 'link 58 'extend the pins B2 Yand "63, the pin 52 extending into'the arm .56 'and thepin' 63 extend ing throughthe other 'end of .the'arm '51 'into `the extension or `pin 52, as .shownin Fig. 3. The center .of 'the 'pin 62 'in the arm '56 is spaced Vfromthe center 'of-the'pinpil a distance Yequal to the :distance onjthe .arm "51 #between the centers of Lthepins 63 and V(5|1whereby Aa parallelogram will'beprovidedlbythe;arms 56 and 51, the link -58 and the portion ofthe arm ".59between the .pinsfSO 'and' 6 .Thearm 56 extends beyondv the ,pin 62 and is connectedbyjthe pin64 to the .plate 4. 'The center of the pin 64 on the 'plate `4 alines withthe 'axialcenter of thejspindle 6, .as shown inFig. 1; ;In'tool"cuttingpositionj'the .center of the cutting .head ^48 'alines with the axial center of the pin B3. When'it isdesiredto [bore a hole .at .apar'ticular Vp oint .inthe work '9 that is .concentric with the -spindle't, the/cenwith .a line (drawn through .the center of j the pins|i3 and 64. 'Theweariandtear '.onthe several parts'then'canibe Itested by checking thisalinementfrom timeyto time. 'Sothat the arm 5,9 may clear .the master35-and enab-lezthe stylus Ywill .clear the master.'35 with'the stylus-wheel l4| pivotally connected thereto attthe end-thereof' by .In ,the embodiment .shown in Figs.

wheel .'4 in engagement .with the .design dening .edge 55.of.the.master`35. Whileit is conceivable .that .the mechanic may depend upon his sense 'of-.touchnot only'to maintain the'stylus wheel 4| engagement withthe master 35 but valso of Eigs..5.and' 6, is 'connected tothe larm 59 by the link 1,3. The bracket 11| is drivingly 'con-,l nected 'to the screw 12 by '.the projection |12 which may be withdrawn from driven engagement with the screw 12 by lever |13, when it is desired quickly to return the bracket 1| for the start of the next operation.

In order to cut a predetermined design, ii it is desired that the proportions shall be as an instance lO-to-l, that is the design dening edge 55 on the master 35 magnified ten times in longitudinal cross section to the contour of the ycavity to be bored or out, then1not only lmust the distance between the centers of the pins|2 and 63 be one-tenth of the distance between the centers =of the pins 69 and 91, but the diameter of the tool .cutting head 48 must also be one-tenth of the diameter of the stylus wheel 4|. In order properly to position the stylus wheel 4| it has also been found necessary as aforesaid that the distance between the pins 64 and 6|] be substantially'identical to the distance between the pins 69 and 61 and that the center of the pin 64 aline with the axial center of the spindle 6 and-a line drawn through the centers of the pins 64, 63 and 61 be parallel to the axial center of the spindie 6, when the center of the tool cutting-head 48 is in alinement not only with the axial center of the pin 63 but `also with the axial center of the spindle 6.

Inv the embodiment shown in Figs. 5 and 6, the frame 14 of a standard lathe such as 'the Logan lathe has formed thereon the spacing bars 15 and 16 with the main plate 11 positioned thereon and secured to the frame 14 by the screws'18 and 19 'extending through the plate 11 and the spacing bar 15 into the bed plate of the frame 14 and the screws 80 and 8| extending'through the plate 11 and spacing bar16 into the bed plate of the frameli. Adjacent to the spacing bar '16 there is formed the master supporting base 82 similar to the master supporting base |'3 ofthe embodiment illustrated in Fig. 1, and therefore it will not be necessary to describe it in ydetail,ex cept to state that it supports a master such as the master 83 with a design defining edge184 to be engaged by a stylus wheel 85. The tool supporting device in this embodiment is diiferent than ythe tool supporting, device in the rst embodiment described and consists of a base B5 which is provided with a bifurcated slot 81 to lreceive the pin 88 extending through the spacer ing engagement with the shank 92. The end of the base 8 remote from' the slot 81 is .provided with a pin 95 which extends through one end of Ythe arm 96 and then into one end of the short link 91, the short link 91, in the present instance, being positioned to operate in the opening 98 in the plate 11. Theother end of the link 91 is connected by the pin 99 with the arm |00. One `end of the arrn is connected .by the pin `||l| to one Vend of the arm |02. The other end of the arm |00 beyond the pin 99 is connected by the pin |93 to the plate 11 with its axis perpendicular to the axis of the spindle |04. The armsl and are mounted to operate on the upper face of the plate 11 and in this way differ from the arms 56 and 51 of the embodiment first described. Otherwise the dimensions of the arms andthe lengths thereof between their respective pins are 4substantially identical to-corresponding parts of the arms se, si anales, ana'therefore a. detail,

description of the same will not be necessary.

The plate is provided with anv opening to receive the master supporting base v82` as isfthe case with the plate 4 of the embodimentillustratedin Figs. 1 to 4, inclusive. The parts mounted on the base 82such as the` slide |05, supporting plate |06, clamping arms |01 and |08,

and associated connections, are all substantially identical to the slide 29, plate 28, clamping arms 3| and `32, and their associated Aconnectionsil lustrated in the embodiment f Figs. lI to 4, inelusive,v and therefore will not be describedv in detail.

The platform 4 inthe embodiment of Figs. 1 to 4,' inclusive, servesas a. support for the portion 65 of the control arm '59, this portion 65 being slidably mountedon theV platform l4 with the arms 56 and 5l being disposed in slidable engagement with the lower face of the platform 4. In this way the attendant is enabled with facility to guide the stylus 4| along the desi-'gn'edge55 without the danger of inaccuracies that,v might result if the arms 56, 51 and 59 were not so'supported in their slidable movement. IIn the embodiment illustrated in Figs. 5 and 6thefplatform 11 cooperates with the arms 96 Vand |00 to support the arms |00,"9 6 and |02 in proper relationship with the master 83, the arms |00fand 96 in this embodiment being mounted to slide on the upper surface of the platform .11,

It is obvious that variouschanges and modifications may be made to the details of the embodiments villustrated without departingfrom the general spirit of the invention set forth in the 1 appended claims.

Iclaim: 1. The combination `of a frame fhavingl arotatively driven work holder, a, platform mounted Ilo holder having an axisparallel to the axis` olf-said on said frame below said lwork holder, 'a tool work holder andv above said platform, means for movably supporting said tool holder on said platform, a design defining master, a support for said master mounted on said platform, means for securing said master .to said. latter support.a stylus for engaging said master, and means lbelow the level of said tool holder for operatively connecting said Stylus to said tool holder, said connecting means including a long arm pivotally `connected at one end to saidbedl directlybelow said work holder, a short arm pivotally connected to said tool holder, a link connecting said arms to one another adjacent to said tool holder, and

a control arm, said stylus being operatively mounted on one end of said control arm ,and

tively" @ontlading said stylus to saidtooi holder, said pantographic device includingfa long arm, a short arm, a short link and a control arm, one end of the long arm being pivotally connected to said `bed directly under said work holder, the other end 'of said long arm -being pivotally connected to one end' of said controlarm, said stylus being connected to the other end of said control arm, one end of the short link being pivotally lconnected to one end of the short arm, the other end of thelshort link being pivotally connected to the long arm adjacent to its connection with the'bed and the other end of .the short arm be`- ing pivotally connected to said control arm adjacent to its connection with the long arm, said three arms `and shortlink throughtheir connections forming a parallelogram and being disposed above the` level' ofsaid platform but well below the'l'evel of4 vsaid work holder and tool holder, a ,bracket mounted on said feed screw, and a long linkpivotally connected to said bracket and to said control arm adjacent to said stylus.

`3. The combination of a lat-he having a bed, a spindle, a rotatable work holder mounted on said vspindle and a feed screw parallelto said spindle and to one side of said bed, a platform mounted on said bed, a tool holder slidably mounted on,

and disposed above said platform, a master se- ,cured to said bed, a stylus for cooperating with 'said master, a pantograp-hic device for operativesaid 4workholder and directly under said work the other end of said control arm being pivotal- 1y connected to said vlong and short arms, the ve connections between said'bed link and three arms making possible the formation ofa parallelogram well below the level of said work holder and tool holder, the axis -of the stylus, pivotal connection between said short link and sho-rt arm andpivotform being in alinement with one another Awhen the tool holder is positioned to bore a khole in axial alinement with the work holder.

val connection between said long arm and' plat- 2. The combination of va lathe having a'bed, a

spindle, a rotatable work holder mounted on said spindle and a feed screw parallel to said spindlev and to one side of said bed, a platform mounted on said bed, a tool holder slidably mountedmon and disposed above said platform, a `mastersecured to said bed, a stylus for cooperating'witlil said master, a pantographic device `for operah'older, the other end of said long arm being pivo'tallyconnected to one end of said control arm, the stylus being pivotally connected to the other end of said, control arm, one end of said short 'adjacent to its pivotal connection with said vlong arm, Vthe three arms and short link forming a parallelo'gr'am with one another and being disposed above the level of said platform" but well below the level of said work holder and tool holder, the axis of the stylus, pivotal connection between said' short link and short arm and pivotalconnection between said long arm and platformbeingin alinement with one another when the tool holder is positioned to bore a hole` in axial alinement with the work holder..

" 4. The combinationof a lathe having a bed, a spindle, a rotatable work holder mounted on said spindle and a feed screw parallel to said spindle and to one side of said bed, a platform mounted on said bed, a tool holder slidably mounted on,

and disposed above, said platform, a mastersecured tosaid bed, a stylus for cooperating with said master, a pantographic device for operatively connecting said stylus to said tool holder,

'said pantographic device including a long arm, a short arm, a short link and a' control arm, one end of the long arm being pivotally connected to said bed with its axis at right angles to the axis of said work `h older,` the other end o f s aid long arm beingpivotally connected to one end of said con- `troljarm, ther stylus Ibeing pivotally connected to l I fthe other endof said control arm, one end offsa'id short link being' pivotally connected to one end of saidfshort arm and lalso yto said tool.holder, .the

other :end -of 1 said Ashort link beingV pivotally .connected to said long'arm adjacent to its pivotal connection with saidbed and the other end of said short arm being pivotally connected to said control arm-adjacent to its pivotal connection with said long-arm, the three arms and short linkforming a parallelogramwith one another, the axis of the stylus, pivotal connection between said short link and short arm and pivotal connection between said long arm and platform being in alinernent with one another when the tool holder ispo- .siticned to bore a hole in axial alinement with the `work holder, a bracket on said feed screw, apro- `jection operatively mounted on saidfbracket to engagethethreads of saidV screw, a lever operatively connected to said projection and bracket l to withdraw said projection from driven engagevgagingsaid master tocooperate therewith, and

a pantographic device below the level of said tool holder operatively connecting said stylus to said tool holdensaid pantographic device including a ,long arm, a short arm, a short link and a control arm, thelongarm and short armvbeing slidably mounted in engagement with the lower face ofsaid platform, Vthe control arm being slidably mounted in engagement with the upper face of .,saidplatform, one end of said long arm being pivotally connected to said bed directly below said work holder Vand the other end beingpivotally connected to one end-of said control arm, the

stylus Ybeing pivotally connected on the other end of lsaid control arm, one end of said short link being pivotally connected to one end of said short arm, the other end of said short link being pivotally connected to said long arm adjacent to its connection with the bed and the other end of said short arm being pivotally connected with ,said Ycontrol arm adjacent to its connection with vsaid long arm.

f6. The combination of `a lathe having a,v bed anda rotatable work holder, a platform mounted onssaidbed below said work holder,a tool holder slidably mounted on said platform and disposed t above said platform, a, master secured to said bed, a stylus engaging said master to cooperate therewith, and a pantographic device .below the level of Asaid tool holder and work holder operatively connecting saidstylus with said tool holdery said 4pantographic device including a long arm, a, short link and a control arm, the long armandshort arm being slidably mounted on said platform, one end of ,said long arm being pivotally connected to ,said bed directly below vsaid work holder, the

otheriendof saidlong arm being pivotally connected to oneend of said control arm, the stylus being mounted on the other end of said control arm, one end of said short link being pivotally connected to one end of said short arm, the other end of said short link beingI pivotally connected to said long arm adjacent to its connection with said `bed and theotherend of said short arm be- .ing pivotally connected tosaid control arm adja- Jcent to its connectionwith .said long-arm, said three arms and Ashort linkiorming -a parallelogram with one another well below the level of said tool :holder and `work holder, the ,axis of the stylus, pivotal connection between said short link and short arm and pivotal connection between said long arm and platformv -being in alinement withione another when the tool holder is positioned to bore a hole in axial alinement with the work holder.

'7. The combination of a frame having a platform, a tool holder slidably mounted on the platform relative to a rotatable work holder; a master secured to the frame; a stylus cooperating with said master; a pantographic device for` operatively connecting said stylus to said tool holder, said pantographic device including-a long arrn,a shortarm, a short link and a control arm, one end of the long arm being pivotally connected to the frame directly under the work holden'the other end of said long arm being pivotally connected to one end of said control arm, said stylus being connected to the other end of said control arm, one end of the short link being pivotally connected to one end of the short arm, the other end of the short link being pivotally connectedfto the long arm adjacent to its connection with the frame and the other end of the short arm being pivotally connected to said control arm adjacent to its connection with the long arm, said three arms `and short link through their connections forming a parallelogram and being disposed above the level of the frame but well below the level of said tool holder; a bracket mounted on a feed screw adjacent to the platiorm; and a long link pivotally connected to said control arm adjacent to said l said master; a pantographic device for operatively connecting said stylus to said tool holder, said pantographic device including a long arm, a short the work holder and directly under the work holder, the other end of said long arm being pivotally connected to one end of. said control arm; the stylus being pivotally connected to the other end of said control arm; one end of said short link being pivotally connected to one end of said shortarm and also to said tool holder, the other end of said short link being pivotally connected to said long arm adjacent to its pivotal connection with the frame and the other end of said short arm being pivotally connected to said control` arm adjacent to its pivotal connection ywith said long arm, the three arms and short link forming a parallelogram with one another and being disposed above the level of the platform but well below the level of said tool holder; and the axis of the stylus, pivotal connection between said short link and short arm and pivotal connection between said long arm and frame being in alinement with one another when the tool holder is positioned to bore a hole in axial alinement with the work holder.

9. The combination of a frame having a platform, a rotatable work holder disposed above the level of said platform, a tool holder movably mounted on said platform and having its axis substantially parallel to the axis of the Work holder and disposed above said platform; a master secured to said frame; a stylus engaging said master to cooperate therewith; and a pantographic device below the level of said tool holder operatively connecting said stylus to said tool holder, said pantographic device including a long arm, a short arm, a short link and a control arm, the long arm and short arm being slidably mounted in engagement with the lower face of said platform, the control arm being slidably mounted in engagement with the upper face of said platform, one end of said long arm being pivotally connected to said platform directly7 below the work holder and the other end being pivotally connected to one end of said control arm, the stylus being pivotally connected on the other end'of said control arm, one end of said short link being pivotally connected to one end of said short arm, the other end of said short link being pivotally connected to said long arm adjacent to its connection with the frame and the other end of said short arm being pivotally connected with said control arm adjacent to its connection with said master; a pantographic device for opera-l tively connecting said stylus to saidv tool holder, said pantographic device including a long arm, a short arm, a\s hort link and a control arm, one end of the long arm being pivotally connected to the frame with its axis at right angles to the axis of the work holder and adjacent to the work holder, the other end of said long arm being pivotally v connected to one end of said control arm; the

stylus being pivotally connected to the other end of said controlarm; one end of said short link beingpivotally connected to one end of said shortarm and also to said tool holder, the other end of said short link being pivotally connected to said long arm adjacent to its pivotal connection with the framev and theother end of said short arm being pivotally connected to saidcontrol arm adjacent to its pivotal connection with said long arm, the three arms and short link forming a parallelogram with one another, and the axis of the stylus, pivotal connection between said short link and short arm` and pivotal connection between said long arm and frame being in alinement with one another when the tool holder is positioned to bore a hole in axial alinement with the work holder.

RAPHAEL ATTI. 

